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All Quotes by author - John M. Grunsfeld

" Absolutely the most fun thing to do in space and rewarding thing, in many ways, is to look back at planet Earth. "

" A deep ocean under the icy crust of Ganymede opens up further exciting possibilities for life beyond Earth. "

" After my spacewalks, I am quite exhilarated but also tired, similar to a workout on Planet Earth. "

" All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It had river deltas. It had snow-capped peaks and puffy clouds and blue sky. Three and a half billion years ago, it was a happening place. The same time on Earth, that's when life started. So did life start on Mars? "

" All space exploration is risky. As an astronaut, I had to decide each and every time I went to space whether or not to risk my life for the mission. "

" A lot of people get home from work and sink into a good chair, the place in their life where they feel most comfortable. I get that comfort in space, the place where I most feel like I belong. "

" Are we alone? Many, many people on planet Earth want to know. We are on the cusp of being able to answer that question... because of the investments we're making in space technology. "

" As a young boy growing up on the South Side of Chicago, I was inspired by the nascent space age. "

" As soon as I could ride a bike... I was always riding over to the Museum of Science and Industry to explore. It's where I first began to develop a fascination with machines and scientific principles. "

" Asteroid detection, tracking, and defense of our planet is something that NASA, its interagency partners, and the global community take very seriously. "

" At the age of six, I declared that I wanted to be an astronaut. My mother thought that was just fine, as it would encourage me to learn science, and besides, there really was no chance I would ever actually become an astronaut. "

" Because of Hubble and other telescopes, we've now discovered that there are probably planets around every star, or virtually every star. There are solar systems around most stars. And the fact that we're here on a planet, Earth, means that it's likely there's lots of other Earths out there. "

" Being an astronaut, there are not a lot of things that have really shocked me in my life. "

" Getting a team of scientists on Mars could be transformative. "

" Going to Mars would make NASA great again. "

" Growing up in Highland Park, in high school, I had some very influential teachers: I had a math teacher who taught calculus that helped me learn to be in love with mathematics; I had a chemistry teacher who inspired us to work what was in the class and to go beyond. "

" Here on Earth, we're exposed to asteroids hitting the Earth, eventual changes in the Sun, changes in the Earth's climate, things we're doing to the Earth's climate. If we want to survive, we need to become a multi-planet species. That's further down the road, but the first wave is going to be the explorers. "

" Here we were, the only seven humans in space, repairing a telescope whose only purpose is to enrich the minds of people on planet Earth and increase our understanding of the workings of the universe. I can think of no better peaceful use of space for all humankind. "

" Hubble has really opened our eyes to what the universe is made of, its structure, and has helped us learn how little we know about the universe. "

" Hubble isn't just a satellite; it's about humanity's quest for knowledge. "

" Hubble showed us the marvel and majesty of stars being born. "

" Hubble uniquely has been able to look in the atmosphere of a planet orbiting a nearby star and figure out what's in that atmosphere. "

" I believe that the future of humans, and the future of Earth, depends on space exploration. That's not a French problem, or a problem for Alabama: it's a planet-wide problem. International cooperation is crucial. "

" I can't imagine anywhere I'd rather be than outside the space shuttle in my space suit next to the Hubble Space Telescope. "

" I don't particularly want to jump out of an airplane with a parachute if I don't have to. I don't want to go bungee jumping. I like adventure with a real purpose that I can buy into. "

" If I could live in space, I would definitely do that. "

" I got lucky and got assigned to Hubble. "

" I grew up on the south side of Chicago in the 1960s, and I think there was a synchronicity of events that inspired me to be an astronaut, and, of course, the backdrop is nothing less than Mercury, Gemini, and Apollo. That was a time in our nation where we aspired to great things, and we achieved them. "

" I have dedicated my life to answering the great scientific questions of our time and to the incredible adventure of space exploration. "

" I have had the privilege to be a member of many high-performance teams at NASA, both on and off the planet. "

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